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Selection Strategy ​

2D projection box vs. 3D frustum ​

  • Current path (2D projection box): project a selectable’s position to screen space (glm.project) and check against the drag rectangle. This is simple and fast, and works well for point-like items and HUD elements (where layout positions are already in screen space).
  • Limitation: true 3D volumes don’t project to axis-aligned rectangles. Using only the projected center can miss partially visible objects or include those whose center is outside but corners intersect the box.

Alternatives ​

  • Project corners to 2D: project the 3D AABB corners, build the convex hull, and test against the selection rectangle. More accurate than center-only, but adds polygon-rect overlap logic per selectable.
  • 3D frustum plane test (preferred for 3D): unproject the drag box corners to build a selection frustum, then test each selectable’s AABB against the frustum planes. This stays in 3D, handles perspective skew, and cleanly captures partial overlaps.
  • For scene 3D selectables with extent: use the frustum-plane test.
  • For HUD or point-like selectables: keep the 2D projection check for simplicity.